Regulation of boiler feed-pumps.



F. HUTTNER. REGULATION OF BOILER FEED PUMPS. APPLICATION FILED $EPT- 4- I912.

1,17,401 Patented July 20, 1915.

Witnesses: Inventor; e: M

a tt L Fritz H Llttner'.

- type and is driven FRITZ HfiTTNERMF BERLIN, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

A CORPORATION OF NEW YORK. 1

anon-Lemon or BOILER FEED-PUMPS...

To all whom it may concern.-

Be it known that I, FRITZ HI'iTTNER, a subject of the King of Prussia, residing at Berlin, Germany, have invented certain new and useful Improvements in Regulation of' Boiler Feed-Pumps, of which the following is a specification.

his invention relates to boiler feed ap paratus, and its object {is to provide for automatically priming the pump when the suction becomes inoperative, and at the same time automatically preventing the racing of the engine which drives the feed pump.

' The novel features are shown in the accompanying drawing, which is a diagrammatic representation of a boiler feed system embodymg my'invention; said system constituting in somerespects an improvement upon the invention disclosed in my pendin application, filed December 19, 1911, Seria No. 671,972. v

The pump 1 is referably of the arotary an suitable engine 2. The throttle valve of sai engine is provided with a stem 3 which is connected toa lever 4'whose free end is pivoted to the rod 5 of, a piston 6 working in a cylinder 7. The under side of said piston, which is of greater area than the upper side, pressure by means of a to the steamrspace of the oiler. above the piston is connected by the pipe 9 to the dehvery pipe 10 of the feed pump, above a check valve 11. This space 1s also open to the atmosphere through a pipe 12, the entrance of which iscontrolled by a valve 13 whose threaded stem can be adjusted to permit a leakage of feed water and vary the effective water' pressure on the upper side of the difierential piston 6, and com, sequently the ratio'of pressure acting upon ipe 8 which runs opposite sides of said piston.

he suction pipe 14 of the pum has a branch 15 running to a'water tan 16:10- cated above the level of the ump. Said branch normally'is kept closed y a valve 17 whose stem is attached to a movable'ablitment, such asthe piston 18. "Apipe 19 leads from the deliverypi e 10 to the-upperside of said abutment so t at'the pressure ofthe column of feed water keeps the valve 17 closed against the;tension of a spring 20 whichtendsto open-it. The piston-18 serves in this position to close a vent pipe-21, leading from the steam space bel Specification of Letters Patent.

is exposed to theboiler- The space ow the piston I Patented July 20, 1915.

Application filed Septeinberl, 1912. Serial No. 718L536.

6; but said moves upward and opens the valve 17.- The operation is, as follows": When the feed pump is operating, the parts standas shown in the drawing. By properl adjusting the valve 13 the proper ra i0 is maintained between the pressure above and below the piston 6 to cause said piston to -regulate the position of the throttle valve of the engine 2, and thereby cause the pump to deliver the feed water at a a given amount higher .than that of the steam in theboiler to be fed. If-now the water supply fails so that air penetrates into the pump and destroys the vacuum, the drop in pressure in the delivery pipe 10 and pipe 19 permits the spring 20 to lift'the valve 17 and at the same time open the vent pipe 21. Two results follow: On the one hand, the water in' the tank 16' can flow down through the branch pipe 15 to the pump and prime it, so that as the water level, rises again in the feed water reservoir 22 the pump can immediately resume delivery. On the other hand, the steam under the piston 6- escapes through the pipe tion side of the pump, so that the waterpressure above the piston 6 can move said piston downward and thereby so .far close the throttion of delivery by the feed pump when the water supply in the reservoir 22 becomes suf enable the pump' to. reestablish its the throtficient to suction, it is necessary to so devise tle valve and other regulating members'of the engine 2 that even at the lowest position o .the come to a stop but will continue to turn Over slowly. As soon as the ump pressure builds up, the valve 17 will piston 18 and the diiferential .resume its work of regulatin the engine, and the supply of feed water.

accordance with thev provisions of the patent statutes, I have described the prin I ciple of operation of my invention, together with the apparatus'which I piston 6 will piston 6 said engine will notv closed by the" the speed of.

21 to the suc- I to insure the automatic resumpe now consider to represent the best embodiment thereof;

but I desire to have it understood that the apparatus shown is .only illustrative, and

that the invention can be carried out by other means.

. What I claim as new and desire to secure by Letters Patent of the United States, is,- 1. The combination of a feed pump, a

suction conduit, a delivery conduit, 3.1112111! Water supply for the pump, an auxiliary water supply, a branch conduit connecting the suctlon conduit with the auxiliary supto open said feed pump,

ling the speed of the engine and exposed on 'feed pump,

. and vent closed.

piston controlr one side to steam pressure and on the other to feed water pressure, and means for reducing the efiective steam pressure when the pumprvacuum breaks.

4. he combination. with an engine-driven of a differential piston controlling the speed of the engine and responsive to pressures of steam and feed water, a vent from the steam side of said piston, and a device controlling said vent and responsive to a drop in feed water pressure.

' 5. The combination with an engine-driven feed pump, of a differential piston controlling the speed of said engine, and responsive to pressures of steam and feed water, a vent from the steam side of said piston, an auxiliary water supply, a valve controlling the same, and a piston exposed to the feed water pressure and normally holding said valve I have hereunto set In witness whereof,

my hand this 17th day of August, 1912.

FRITZ HT ITTNER.

Witnesses Enron UBERLEE. ADELBERT' PRAGER. 

